I've had several instances where I've been able to remove drives from RAID 1 arrays and successfully read them individually using desktops and even USB housings (for the SATA) - both SCSI and SATA. However, some controllers put some "metadata" on the FS and that can make them incompatible with any other controllers.
I'm not familiar with the PowerEdge 1750, but a quick eBay search shows dual Xeon MBs available for them priced at below $25, delivered. There are a wide variety of low-priced other components available there, too. So, I guess that it's really a matter of what it's worth to you.
I can say that I've never harmed the contents of a RAID element by plugging it into another (non RAID) controller, so if I were in your position, I'd try that with a couple of SCSI-equipped computers and, if that fails, I'd consider buying the parts to fix the 1750. You can always sell the machine or part it out on eBay if cost is a serious consideration.
Hmmm, I think that I may still have a couple of SCSI machines laying around here somewhere...
Good luck with whatever you end up trying - and please, let us know how you solved the problem.